Brush 2 tbsp melted butter onto the bottom and sides of a 9" x 10" baking dish.
Arrange the pancakes in overlapping layers in the dish.
Pour the French toast batter evenly over the pancakes, ensuring all are soaked.
Mix the melted butter (½ cup) and brown sugar in a small bowl. Drizzle half over the pancakes.
Cover with plastic wrap and refrigerate for at least 2-3 hours or overnight for best results.
Preheat the oven to 400°F.
Remove the dish from the fridge and discard the plastic wrap. Sprinkle 1 cup of blueberries and ¼ cup of pecans over the top.
Bake uncovered for 35 minutes on the center oven rack.
Remove the dish from the oven and drizzle the remaining melted butter and brown sugar mixture over the French toast pancakes.
Top the French Toast Pancakes Casserole with homemade whipped cream (recipe below) and freshly grated orange zest.
Add more fresh blueberries and chopped pecans. Serve with pancake or maple syrup.